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Add a solution for Finders Keepers challenge (#35655)

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* Add a solution for Finders Keepers challenge

* Update link to markdown

* fix: removed repl.it link

* fix: made this the Intermediate Solution

* fix: added correct Intermediate icon
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Nikolai Kiselev
2019-03-23 19:35:58 +04:00
committed by Randell Dawson
parent 4a7861ce87
commit 4bc1d74f2a
1 changed files with 25 additions and 3 deletions
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guide/english/certifications/javascript-algorithms-and-data-structures/basic-algorithm-scripting/finders-keepers/index.md
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--- ---
title: Finders Keepers title: Finders Keepers
--- ---
## Problem Explanation ![](//discourse-user-assets.s3.amazonaws.com/original/2X/f/ff2fd8ffa014eea28587a8ef4933340d3dcc4b09.jpg)
![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
## ![:checkered_flag:](https://forum.freecodecamp.com/images/emoji/emoji_one/checkered_flag.png?v=3 ":checkered_flag:") Problem Explanation:
We need to return the element from an array that passes a function. Both the `function` and the `array` are passed into our function `findElement(arr, func)`. We need to return the element from an array that passes a function. Both the `function` and the `array` are passed into our function `findElement(arr, func)`.
## Hint: 1 ## Hint: 1
@ -16,7 +22,7 @@ Looking through the array can be done with a `for` loop.
Do not forget, if none of the numbers in the array pass the test, it should return `undefined`. Do not forget, if none of the numbers in the array pass the test, it should return `undefined`.
>*try to solve the problem now* >*try to solve the problem now*
## Basic Solution ## ![:beginner:](https://forum.freecodecamp.com/images/emoji/emoji_one/beginner.png?v=3 ":beginner:") Basic Code Solution:
```javascript ```javascript
function findElement(arr, func) { function findElement(arr, func) {
@ -40,8 +46,18 @@ function findElement(arr, func) {
* The pre-defined function already checks each number for us, so if it is "true", we return that num. * The pre-defined function already checks each number for us, so if it is "true", we return that num.
* If none of the numbers in the array pass the function's test, we return undefined. * If none of the numbers in the array pass the function's test, we return undefined.
## ![:sunflower:](https://forum.freecodecamp.com/images/emoji/emoji_one/sunflower.png?v=3 ":sunflower:") Intermediate Code Solution:
```javascript
function findElement(arr, func) {
return arr.find(func);
}
```
## Advanced Solution #### Relevant Links
* [Array.prototype.find](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find)
## ![:rotating_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/rotating_light.png?v=3 ":rotating_light:") Advanced Code Solution:
```javascript ```javascript
function findElement(arr, func) { function findElement(arr, func) {
@ -55,3 +71,9 @@ function findElement(arr, func) {
2. Use the function in the 2nd parameter as the callback function in arr.map() 2. Use the function in the 2nd parameter as the callback function in arr.map()
3. Acquire the index of the first number that meets the condition in the function. 3. Acquire the index of the first number that meets the condition in the function.
4. Use that index to display the first available number that meets the condition. 4. Use that index to display the first available number that meets the condition.
## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
* ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
* Add an explanation of your solution.
* Categorize the solution in one of the following categories -- **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")